v2.0.2-rc (#27)

## v2.0.2-rc

### BREAKING CHANGES

* Refactored `config.json` - will need to verify configuration settings prior to mounting

### Issues

* \#12 \[Unit Test\] Complete all providers unit tests
* \#14 \[Unit Test\] SQLite mini-ORM unit tests and cleanup
* \#16 Add support for bucket name in Sia provider
* \#17 Update to common c++ build system
  * A single 64-bit Linux Jenkins server is used to build all Linux and Windows versions
  * All dependency sources are now included
  * MSVC is no longer supported
  * MSYS2 is required for building Windows binaries on Windows
  * OS X support is temporarily disabled
* \#19 \[bug\] Rename file is broken for files that are existing
* \#23 \[bug\] Incorrect file size displayed while upload is pending
* \#24 RocksDB implementations should be transactional
* \#25 Writes should block when maximum cache size is reached
* \#26 Complete ring buffer and direct download support

### Changes from v2.0.1-rc

* Ability to choose between RocksDB and SQLite databases
* Added direct reads and implemented download fallback
* Corrected file times on S3 and Sia providers
* Corrected handling of `chown()` and `chmod()`
* Fixed erroneous download of chunks after resize

Reviewed-on: #27

cmake/libraries/curl.cmake

@@ -0,0 +1,49 @@
+if(PROJECT_ENABLE_CURL)
+  if(PROJECT_BUILD)
+    add_definitions(-DPROJECT_ENABLE_CURL)
+
+    find_package(CURL ${CURL_VERSION} REQUIRED)
+
+    include_directories(BEFORE SYSTEM ${CURL_INCLUDE_DIRS})
+
+    link_libraries(CURL::libcurl)
+
+    if (EXISTS ${PROJECT_DIST_DIR}/cacert.pem)
+      file(REMOVE ${PROJECT_DIST_DIR}/cacert.pem)
+    endif()
+    file(DOWNLOAD https://curl.haxx.se/ca/cacert.pem ${PROJECT_DIST_DIR}/cacert.pem)
+  elseif(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
+    ExternalProject_Add(curl_project
+      PREFIX external
+      URL ${PROJECT_3RD_PARTY_DIR}/curl-${CURL_VERSION}.tar.gz
+      URL_HASH SHA256=${CURL_HASH}
+      LIST_SEPARATOR |
+      CMAKE_ARGS 
+        ${PROJECT_EXTERNAL_CMAKE_FLAGS}
+        -DBUILD_SHARED_LIBS=${PROJECT_BUILD_SHARED_LIBS}
+        -DBUILD_STATIC_LIBS=ON
+        -DBUILD_CURL_EXE=OFF
+        -DBUILD_STATIC_CURL=ON
+        -DBUILD_STATIC_LIBS=ON
+        -DBUILD_TESTING=OFF
+        -DCURL_CA_BUNDLE=./cacert.pem
+        -DCURL_CA_FALLBACK=ON
+        -DCURL_DISABLE_LDAP=ON
+        -DCURL_USE_LIBPSL=OFF
+        -DCURL_USE_LIBSSH2=OFF
+        -DCURL_USE_OPENSSL=${PROJECT_ENABLE_OPENSSL}
+        -DCURL_ZLIB=ON
+        -DENABLE_THREADED_RESOLVER=ON
+        -DOPENSSL_ROOT_DIR=${OPENSSL_ROOT_DIR}
+        -DOPENSSL_USE_STATIC_LIBS=${OPENSSL_USE_STATIC_LIBS}
+        -DUSE_LIBIDN2=OFF
+        -DZLIB_USE_STATIC_LIBS=${ZLIB_USE_STATIC_LIBS}
+    )
+
+    list(APPEND PROJECT_DEPENDENCIES curl_project)
+
+    if (NOT CMAKE_HOST_WIN32)
+      add_dependencies(curl_project openssl_project)
+    endif()
+  endif()
+endif()